ALLIANT POWER HP4 TO DCR FUEL PUMP CONVERSION KIT 608990 | 2017-2023 6.6L DURAMAX L5P

Upgrade the fuel system in your L5P Duramax with the Alliant Power 608990 HP4 to DCR Fuel Pump Conversion Kit. Designed specifically for the 6.6L Duramax platform, this complete conversion replaces the factory HP4 high-pressure fuel pump with the proven DCR (Diesel Common Rail) pump to provide improved long-term reliability and consistent fuel delivery.

Whether you're repairing a failed fuel system or upgrading for added peace of mind, this direct-fit kit includes the DCR pump along with the required high-pressure, supply, and return fuel tubes for a straightforward installation. The DCR pump is engineered to provide dependable common rail pressure under demanding conditions, making it an excellent choice for stock, towing, and tuned applications.

Features:

• Converts the factory HP4 pump to a DCR high-pressure fuel pump
• Direct-fit conversion designed specifically for the L5P Duramax
• Improved long-term durability and reliability
• Supports consistent high-pressure common rail fuel delivery
• Ideal for stock, towing, and performance applications
• Complete installation kit with required fuel tubes and hardware

Kit Includes:

• DCR high-pressure fuel pump
• High-pressure pump fuel tube
• High-pressure fuel rail tube
• Low-pressure return fuel tube
• Low-pressure supply fuel tube
• Supply tube hold-down bolt